Add clip_to_line_end to display_map/snapshot and set it to ensure vim positioning in normal mode

Co-authored-by: Nathan Sobo <nathan@zed.dev>

crates/editor/src/test.rs

@@ -2,6 +2,11 @@ use std::ops::Range;
 
 use collections::HashMap;
 
+use crate::{
+    display_map::{DisplayMap, DisplaySnapshot, ToDisplayPoint},
+    DisplayPoint, MultiBuffer,
+};
+
 #[cfg(test)]
 #[ctor::ctor]
 fn init_logger() {
@@ -54,3 +59,30 @@ pub fn marked_text_ranges(
         .collect();
     (unmarked_text, ranges)
 }
+
+// Returns a snapshot from text containing '|' character markers with the markers removed, and DisplayPoints for each one.
+pub fn marked_display_snapshot(
+    text: &str,
+    cx: &mut gpui::MutableAppContext,
+) -> (DisplaySnapshot, Vec<DisplayPoint>) {
+    let (unmarked_text, markers) = marked_text(text);
+
+    let tab_size = 4;
+    let family_id = cx.font_cache().load_family(&["Helvetica"]).unwrap();
+    let font_id = cx
+        .font_cache()
+        .select_font(family_id, &Default::default())
+        .unwrap();
+    let font_size = 14.0;
+
+    let buffer = MultiBuffer::build_simple(&unmarked_text, cx);
+    let display_map =
+        cx.add_model(|cx| DisplayMap::new(buffer, tab_size, font_id, font_size, None, 1, 1, cx));
+    let snapshot = display_map.update(cx, |map, cx| map.snapshot(cx));
+    let markers = markers
+        .into_iter()
+        .map(|offset| offset.to_display_point(&snapshot))
+        .collect();
+
+    (snapshot, markers)
+}